Country Joe

Joe McDonald sings during the concert marking the 40th anniversary of the Woodstock music festival August 15, 2009, in Bethel, New York.

At Woodstock "Country Joe" performed solo on Saturday and then with Country Joe and the Fish on Sunday.

McDonald plans to perform at the "Heroes of Woodstock" with members of Jefferson Starship, Canned Heat, Big Brother & the Holding Company, on Aug. 16 in Cobb, Calif.

Credit: Mario Tama/Getty Images

Santana

Carlos Santana, right, and David Brown perform at Woodstock.

Their debut album, "Santana," was released later in August 1969.

Credit: AP

Carlos Santana

Musician Carlos Santana performs during the first stage of his German "Live Your Light 2008 Tour" in Salem , southern Germany, July 2, 2008.

Santana released "Corazon" in May 2014. In July, Carlos Santana performed the 2014 FIFA World Cup official Anthem with Wyclef Jean, Avicii and Alexandre Pires in Rio de Janeiro, Brazil for the closing ceremonies of the tournament.

Credit: Daniel Maurer/AP

John Sebastian

The Lovin' Spoonful, from left, Joe Butler, John Sebastian, Zal Yanovsky, and Steve Boone, pose after accepting their award during the 15th Annual Rock and Roll Hall of Fame Induction Dinner Monday, March 6, 2000, at New York's Waldorf-Astoria.

John Sebastian was not on the bill but was recruited to play on Saturday afternoon when several of the performers were running late.

Sebastian tours as a solo performer, with dates lined up through 2015.

Credit: Ed Betz/AP

Incredible String Band

The Scottish psychedelic folk group formed in 1966 and recorded 12 albums before splitting in 1974.

Credit: Elektra Records

Canned Heat

Dale Spalding of Canned Heat sings during the Heros of Woodstock concert at Bethel Woods Center for the Arts in Bethel, New York., Aug. 15, 2009.

Three members of the band who played at Woodstock in 1969, Harvey "The Snake" Mandel, Larry "The Mole" Taylor and Adolfo "Fito" de la Parra, still tour as Canned Heat.

Credit: Craig Ruttle/AP

Mountain

Leslie West, right, and Rev Jones of Mountain perform at the concert marking the 40th anniversary of the Woodstock music festival Aug. 15, 2009 in Bethel, New York.

Grateful Dead

Stormy weather caused the amplifiers to overload as the band played, cutting their set short.

Credit: AP

Grateful Dead

Members of the Grateful Dead, from left, Bob Weir, Phil Lesh and Mickey Hart, speak at a news conference, Feb. 4, 2008, shortly before performing a fundraising concert for presidential hopeful Sen. Barack Obama in San Francisco.

The Grateful Dead toured extensively until the 1995 death of guitarist Jerry Garcia. Members occasionally perform as "The Dead." Bob Weir and RatDog recently canceled their summer 2014 tour, which was supposed to start in Boston on Aug. 14, 2014.

Creedence Clearwater Revival

At the time of Woodstock the band was working on its fourth album, "Willy and the Poor Boys."

The Oakland, Calif. group disbanded in 1972.

Credit: Conqueroo

John Fogerty

John Fogerty on "CBS This Morning" in 2013.

Tom Fogerty was the first member of the band to leave, in 1970. He died in 1990.

The subsequent decades have been fraught with lawsuits between the surviving members. When asked about reuniting with the two surviving band members in 2013, Fogerty told Charlie Rose of "CBS This Morning": "From time to time, I'll say something and it'll get in print that maybe that will happen, and then immediately I'll hear back stuff that doesn't sound like it's possible. ... I think it's a possibility in the future, you know. It's not something I'm actively seeking, but I'm not totally against the idea either."

Fogerty is touring the U.S. and Canada in the fall of 2014 and did a batch of dates with Jackson Browne in the summer of 2014.

Credit: CBS

Janis Joplin

Janis Joplin performed at Woodstock with the Kozmic Blues Band.

She died of a drug overdose in October 1970.

Credit: Sony Legacy

Sly and the Family Stone

Sylvester "Sly" Stone of Sly and the Family Stone, December 10, 1970.

The band was active from 1967 to 1971. Sly Stone continued to tour as Sly and the Family Stone until 1983.

Credit: AP

Sly Stone

Sly Stone performing at the 48th annual Grammy Awards in 2006.

Largely reclusive, Sly Stone is the source of speculation due to his infrequent and brief appearances. At the 2006 Grammy Awards Stone played with the band for three minutes before leaving the stage.

Credit: AP

The Who

Writer Jane Scott, right, interviews The Who, from left, Keith Moon, Pete Townshend, John Entwistle and Roger Daltry, in the late 1960s.

At Woodstock, The Who played several songs from their rock opera "Tommy." Activist Abbie Hoffman famously grabbed a microphone as the band members were tuning their instruments and was knocked off stage by guitarist Pete Townshend.

Credit: AP

The Who

Roger Daltrey, left, and Pete Townshend of The Who perform at "12-12-12" a concert benefiting The Robin Hood Relief Fund to aid the victims of Hurricane Sandy at Madison Square Garden in New York City, Dec. 12, 2012.

Drummer Keith moon died in 1978, and bass player John Entwistle died in 2002. The band has announced a 50th anniversary tour starting in November 2014.

Jefferson Airplane

Jefferson Airplane

Members of Jefferson Starship Paul Kantner, left, and Slick Aguilar perform in Bethel, New York in 2009.

Members of Jefferson Airplane are touring the U.S. as Jefferson Starship in the summer and fall of 2014 and throughout 2015 as a 50th anniversary tour. Jack Casady and Jorma Kaukonen's group, Hot Tuna, is touring the U.S. through December 2014.

Credit: Mario Tama/Getty Images

Joe Cocker

Joe Cocker performs onstage at Woodstock Music and Art Fair after the release of his first album "With a Little Help from My Friends."

The Band

The Band with Richard Manuel on piano, Levon Helm on drums, lead guitarist Robbie Robertson, center, and bass guitarist Rick Danko, take the stage for their final live performance before a crowd of 5,000 at Winterland Auditorium in San Francisco, Nov. 27, 1976.

The Band recorded with Bob Dylan at his Woodstock home in 1967 and as The Band in nearby West Saugerties, New York in a house they named "Big Pink." The Band's debut album, "Music From Big Pink," came out in 1968.

Credit: John Storey/AP

Robbie Robertson

Robbie Robertson, of the Band" appears on "CBS This Morning" in October 2013.

Various line-ups of The Band played through the 1990s. Richard Emanuel died in 1986, while Rick Danko died in 1999. More recently, drummer and vocalist Levon Helm died in 2012.

Robbie Robertson has been a music supervisor on several films, including several directed by Martin Scorsese.

Johnny Winter

Winter recorded several albums for various labels, often with his brother, Edgar Winter.

He died on July 16, 2014, two days after playing a concert in Cahors, France.

Credit: Getty images

Crosby, Stills, Nash & Young

From left: Neil Young, David Crosby, Stephen Stills and Graham Nash pose for a photograph before the premiere of their film "CSNY Deja Vu" at the Sundance Film Festival in Park City, Utah, Jan. 25, 2008.

The super group's debut album, "Crosby, Stills & Nash," was released in May 1969 and at the time of Woodstock, the band was touring with Neil Young, who performed on a few songs during the set.

Woodstock was their second time performing live as a band.

Credit: Amy Sancetta/AP

Crosby, Stills & Nash

Crosby, Stills & Nash performs in front of a crowd at the Sands Bethlehem Event Center, in Bethlehem, Pa., June 24, 2012.

The band is currently touring the U.S. with concerts scheduled through early October.

Credit: The Express-Times, Matt Smith/AP

Paul Butterfield Blues Band

Singer Paul Butterfield performs at New York's Palladium Theater Oct. 1, 1977 in a benefit performance for the New York Public Library to purchase rare blues record.

Paul Butterfield was known for his electric guitar style and skill on harmonica. In 1971 he bought a house in Woodstock.

He died in 1987.

Credit: AP

Sha Na Na

Fifties singing group Sha Na Na rocks under the Golden Arches and "Speedee" road sign on Aug. 18, 2003, to celebrate the 50th anniversary of the oldest operating McDonald's located in Downey, Calif.

The doo-wop group started as an a capella group at Columbia University and hosted a television show from 1977-1981.

Credit: AP

Jimi Hendrix

Jimi Hendrix was the festival's headliner, but of the hundreds of thousands in attendance only between 30,000 and 40,000 heard his performance of "The Star Spangled Banner" at 11:00 a.m. Monday morning.

He died Sept. 19, 1970.

Credit: Henry Diltz/PRNewsFoto

Woodstock

A plaque marks the original site location as the 40th anniversary of the Woodstock music festival approaches August 14, 2009 in Bethel, New York.

Los Angeles band Sweetwater was supposed to open the three-day concert, but was delayed by traffic congestion. Singer Nasi Nevins was injured in a car crash in Dec. 1969 cutting short the band's career. Three surviving members performed at Woodstock '94.

Bert Sommer, who played "Woof" in the original Broadway production of "Hair," sang Simon & Garfunkel's "America" at Woodstock. He died in July 1990.

Credit: Mario Tama/Getty Images

Woodstock

The Boston-based band, Quill, led by brothers Jon and Dan Cole opened Saturday's bill, but broke up by the end of the year.

Keef Hartley Band played on Aug. 16, 1969. The band released five albums between 1969 and 1972. Keith "Keef" Hartley died in November 2011.

Ten Years After played at Woodstock on Aug. 17, 1969. The band toured until 1973.

Guitarist Alvin Lee died in March 2013. Original members Chick Churchill and Ric Lee are still performing and touring Germany and Switzerland in 2014.